This compound, known as quinine hydrochloride, is primarily utilized as an antimalarial agent in the pharmaceutical industry, effective against Plasmodium falciparum, including chloroquine-resistant strains. It is also employed to treat nocturnal leg muscle cramps. In chemical research and synthesis, quinine serves as a chiral resolving agent, a ligand in asymmetric catalysis, and a model compound for studying alkaloid pharmacology and fluorescent properties. Additionally, it finds applications in the food and beverage industry as a bittering agent in tonic water and other products.